November 13, 2012 By David KanterCompared to Nehalem, the Haswell core offers 4× the peak FLOPs, 3× the cache bandwidth, and nearly 2× the re-ordering window. Overall, we estimate that a Haswell core will offer around 10% greater performance for existing software, compared to Sandy Bridge. For workloads using the new extensions, the gains could be significantly higher. In theory, AVX2 and FMA can boost performance by 2×

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